It seems to be an Eastern cultural thing to cook based on feeling, rather than using measuring cups and step by step instructions.  At least that’s how we do it in my household.  I guess that’s why we never quite know if our food will turn out like that one time when it was perfect and wonderful (and usually it doesn’t, pity).  But hey, it’s a lot more fun that way and when you get enough practice, soon enough you can cook pretty consistently.  It’s a good way of testing your culinary skills!  Besides, having that variation allows for unintentional discoveries that can be quite fun.  I personally enjoy never knowing what my food will end up tasting like.  Makes meals just a little more exciting.  :-P